Tests: Add integration with Istanbul NYC

Ref qunitjs/qunitjs.com#156.

.editorconfig

@@ -1,5 +1,4 @@
-# This file is for unifying the coding style for different editors and IDEs
-# editorconfig.org
+# https://editorconfig.org
 
 root = true
 
@@ -12,6 +11,8 @@ insert_final_newline = true
 
 [test/cli/TapReporter.js]
 trim_trailing_whitespace = false
+[test/integration/nyc.js]
+trim_trailing_whitespace = false
 
 [*.{yml,md}]
 indent_style = space

test/integration/nyc.js

@@ -0,0 +1,34 @@
+const cp = require( "child_process" );
+const path = require( "path" );
+const DIR = path.join( __dirname, "nyc" );
+
+QUnit.module( "nyc", {
+	before: () => {
+		cp.execSync( "npm install --prefer-offline --no-audit", { cwd: DIR, encoding: "utf8" } );
+	}
+} );
+
+QUnit.test( "test", assert => {
+	const expected = `
+TAP version 13
+ok 1 add > two numbers
+1..1
+# pass 1
+# skip 0
+# todo 0
+# fail 0
+--------------|---------|----------|---------|---------|-------------------
+File          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
+--------------|---------|----------|---------|---------|-------------------
+All files     |   85.71 |      100 |      50 |   85.71 |                   
+ nyc          |     100 |      100 |     100 |     100 |                   
+  index.js    |     100 |      100 |     100 |     100 |                   
+ nyc/src      |      75 |      100 |      50 |      75 |                   
+  add.js      |     100 |      100 |     100 |     100 |                   
+  subtract.js |      50 |      100 |       0 |      50 | 2                 
+--------------|---------|----------|---------|---------|-------------------
+`.trim();
+
+	const actual = cp.execSync( "npm test", { cwd: DIR, encoding: "utf8" } );
+	assert.pushResult( { result: actual.includes( expected ), actual, expected } );
+} );

test/integration/nyc/.gitignore

@@ -0,0 +1,3 @@
+/.nyc_output/
+/coverage/
+/node_modules/

test/integration/nyc/README.md

@@ -0,0 +1,25 @@
+# QUnit ♥️ Istanbul
+
+```bash
+npm test
+```
+
+```
+TAP version 13
+ok 1 add > two numbers
+1..1
+# pass 1
+# skip 0
+# todo 0
+# fail 0
+--------------|---------|----------|---------|---------|-------------------
+File          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
+--------------|---------|----------|---------|---------|-------------------
+All files     |   85.71 |      100 |      50 |   85.71 |
+ nyc          |     100 |      100 |     100 |     100 |
+  index.js    |     100 |      100 |     100 |     100 |
+ nyc/src      |      75 |      100 |      50 |      75 |
+  add.js      |     100 |      100 |     100 |     100 |
+  subtract.js |      50 |      100 |       0 |      50 | 2
+--------------|---------|----------|---------|---------|-------------------
+```

test/integration/nyc/index.js

@@ -0,0 +1,7 @@
+const add = require( "./src/add.js" );
+const subtract = require( "./src/subtract.js" );
+
+module.exports = {
+	add,
+	subtract
+};

test/integration/nyc/package.json

@@ -0,0 +1,21 @@
+{
+  "private": true,
+  "devDependencies": {
+    "nyc": "15.1.0",
+    "qunit": "file:../../.."
+  },
+  "scripts": {
+    "test": "nyc qunit"
+  },
+  "nyc": {
+    "exclude": [
+      "test/"
+    ],
+    "report-dir": "coverage/",
+    "reporter": [
+      "text",
+      "html",
+      "lcov"
+    ]
+  }
+}

test/integration/nyc/src/add.js

@@ -0,0 +1,5 @@
+function add( a, b ) {
+	return a + b;
+}
+
+module.exports = add;

test/integration/nyc/src/subtract.js

@@ -0,0 +1,5 @@
+function substract( a, b ) {
+	return a - b;
+}
+
+module.exports = substract;

test/integration/nyc/test/add.js

@@ -0,0 +1,7 @@
+const add = require( "../index.js" ).add;
+
+QUnit.module( "add", () => {
+	QUnit.test( "two numbers", assert => {
+		assert.equal( add( 1, 2 ), 3 );
+	} );
+} );